Agilent Technologies 8453 Operator's Manual page 114

9 GPIB Commands
STA – Status
READY
is set to 1 whenever the cell temperature reaches the set temperature. This bit
is 0 whenever the cell temperature is out of the limits or has not reached the
set temperature. It is like the Ready LED on the front panel of the
temperature control unit.
REPLY READY
is set to 1 whenever there are data in the temperature control unit out-buffer
ready to be read by the computer. Reading the data will clear this bit.
READY FOR INSTRUCTION
is set to 1 whenever the temperature control unit is in a state to allow new
instructions to be received. This bit is cleared immediately after any
instruction is received and becomes set again after the temperature control
unit has dealt with the instruction. For the STA instruction, this bit is always 0
because STA is an instruction itself and therefore resets this bit to 0. The serial
poll does not disturb the device function (being an interface command as
opposed to an temperature control unit instruction) and therefore only the
received status in response to the serial poll command is meaningful.
ERROR
is set to 1 whenever the temperature control unit detects an error condition.
This bit is cleared by reading the error with the ERR instruction.
SERVICE REQUEST
is set to 1 whenever the temperature control unit that is included in the
current SRQ mask makes a 0 to 1 transition (see the
Mask"
interface status is read with GPIB serial poll or device clear command. For the
STA instruction, this bit is always 0.
POWER ON
is set to 1 when the temperature control unit restarts itself after a software or
hardware failure. If the temperature control unit is turned on by the power
switch the bit is always reset to 0.
114 Temperature Control Accessory for Agilent 8453 UV-visible Spectrophotometer Operator's Manual
on page 106 instruction). This bit is cleared whenever the current
"MSK – Service Request